TY  - JOUR
TI  - Geochemical, microthermometric, and isotopic constraints on the origin of fluorite deposits in central Anatolia, Turkey
AB  - We investigate rare earth element geochemistry, microthermometric characteristics, and radiogenic isotope systematics offluorites and stable isotope compositions of gangue minerals from several fluorite deposits in central Turkey. In the deposits, fluorite isthe main ore mineral and it is accompanied by quartz, calcite, and minor pyrite and barite. Veins are represented by three different fluoritetypes based on their color. Total REY contents of fluorites are highly variable, ranging from 24 to 693 ppm. LREE concentrations offluorites of all colors are similar but medium and heavy REE abundances of green fluorites are nearly an order of magnitude greater thanin both host rocks and purple and yellow fluorites, indicating multiple sources for crystallization. REEs show significant fractionation andpurple fluorites with relatively low HREE contents were likely precipitated at an earlier stage. As crystallization continued, green fluoriteswere nucleated because of ion exchange of LREEs with the host rock/minerals. Fluid inclusions yielded a wide range of homogenizationtemperatures from 86 °C to 292 °C and salinities from 0 to 20 wt.% NaCl equiv. The87 Sr/ 86 Sr ratios of fluorites, varying from 0.707627to 0.709380, overlap with the range of host rocks.143 Nd/ 144 Nd values suggest two populations: purple fluorites with less radiogenic andgreen fluorites with more radiogenic Nd isotope ratios. The Sr-Nd isotope systematics of Bayındır fluorites are consistent with that of theBayındır syenite, indicating that hydrothermal solutions progressively reacted with the host rock until equilibrium was established. δ 18 Ovalues of quartz are slightly higher than the magmatic range. δ 13 C and δ 18 O of calcites fall into the range of marine carbonates. δ 34 S valuesof barites indicate derivation from diverse reservoirs changing from marine to terrestrial sources. In contrast, sulfur in pyrites pointsto a magmatic origin. Therefore, is it suggested that magmatic fluids to some extent contributed to the precipitation of fluorite veins.
AU  - COŞANAY, Pelin
AU  - KIRAT, Ece
AU  - KIZILKANAT, Ceyda
AU  - KOÇ, Şükrü
AU  - Mutlu, Halim
AU  - ÇEVİK, Nihal
PY  - 2017
JO  - Turkish Journal of Earth Sciences
VL  - 26
IS  - 3
SN  - 1300-0985
SP  - 206
EP  - 226
DB  - TRDizin
UR  - http://search/yayin/detay/244159
ER  -